Ian,I am probably nearest to you but until the gritter lorries appear I am a bit stuck.To be going on with - lasers are very tricky and a better solution is to use a barlowed laser (laser stuck into a balow lens) in combination with a central doughnut (adhesive reinforcing ring) on the mirror. This link explains it quite well:http://www.cameraconcepts.com/barlowed% ... mation.pdfIf you are still stuck then after the snow melts I can pop over.David

Ian,I am in all day Monday waiting for DHL to collect my failed observatory PC so if you can pop over then I can have a look - something sounds loose if it changing collimation that easily.If you email me: davidr AT deep-sky.co.uk I will send my address.David

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